This paper considers the problems of measuring and modelling production disturbances in discrete manufacturing operations, in conjunction with the design and operation of manufacturing control systems, capable of handling both internal and external production disturbances. The approach given here, is that being developed by the MASCADA Consortium [MASCADA, 1997] within a multiagent systems envi...

Habitat disturbance affects numerous ecosystem components and processes, but its effect on continuous soybean system is less available. Soybean was seeded following six preceding crops, including grain soybean (Glycine max L. Merill.), wheat (Triticum aestivum L.), sugar beet (Beta vulgaris L.), tobacco (Nicotiana tabacum L.), corn (Zea mays L.) and hemp (Cannabis Satia L.), on a Mollisol ...

Previous studies of the so-called frontier production function have not utilized an adequate characterization of the disturbance term for such a model. In this paper we provide an appropriate specification, by defining the disturbance term as the sum of symmetric normal and (negative) half-normal random variables. Various aspects of maximum-likelihood estimation for the coefficients of a produc...

In grazed habitats is a tradeoff between competition (decreases with the grazing intensity) and disturbance (increases). This may give tradeoffs between plant life stages. The seed production can be assumed to decrease at high disturbance intensities because of herbivory of reproductive organs, but also at high levels of competition (low grazing intensity) because of resource limitation. The es...

This study presents a reduction of production disturbances of a shoemaking industry through discrete event simulation approach. The study is conducted at Peacock Shoe factory found in Addis Ababa, Ethiopia.  This factory faces line balancing problem that becomes production disturbance for its assembly lines. Detail time study is carried out for the selected shoe model using stopwatch. Assembly ...

North Carolina’s forest disturbance and timber production assessed using time series Landsat observations Chengquan Huang, Pui-Yu Ling & Zhiliang Zhu To cite this article: Chengquan Huang, Pui-Yu Ling & Zhiliang Zhu (2015): North Carolina’s forest disturbance and timber production assessed using time series Landsat observations, International Journal of Digital Earth, DOI: 10.1080/17538947.2015...

Classical extremum seeking control (ESC), when applied to systems with disturbances, can be subject to large deviations during transients caused by abrupt changes in the disturbances. In oil and gas production applications, such deviations can make ESC impractical. This paper presents a simple yet practical extension to the classical gradient-based extremum seeking control to make it robust to ...

Bottom trawling has widespread impacts on benthic communities and habitats. It is argued that the impact of chronic bottom trawling on benthic infauna depends on the natural disturbance levels to which benthic communities are adapted. We analysed biomass, production and size structure of two communities from a muddy and a sandy habitat, in relation to quantified gradients of trawling disturbanc...

PURPOSE/OBJECTIVES To evaluate and discuss existing studies of mindfulness-based stress reduction (MBSR) among breast cancer survivors. DATA SOURCES Articles published from 1987-2009 were retrieved using MEDLINE®, CINAHL®, Ovid, and Scopus. Key words, including mindfulness-based stress reduction and mindfulness meditation, were combined with breast cancer. DATA SYNTHESIS The search resulted...

sleep plays a vital role in regulating physiological mechanisms in the human body. nowadays, by the change of lifestyle and as a consequence of longer work hours and increased accessibility to media, sleep disturbance becomes a common problem in modern society. many studies demonstrated that sleep disturbance triggers a systemic low-grade inflammation by increasing the level of several cytokine...